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Solução_Calculo_Stewart_6e

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F.<br />

58 ¤ CHAPTER 2 LIMITS AND DERIVATIVES<br />

⎧<br />

x +2 ⎪⎨<br />

if x1<br />

TX.10<br />

f is continuous on (−∞, 0) and (1, ∞) sinceoneachoftheseintervals<br />

it is a polynomial; it is continuous on (0, 1) since it is an exponential.<br />

Now lim f(x) = lim +2)=2and lim f(x) = lim<br />

x→0− x→0−(x ex =1,sof is discontinuous at 0. Sincef(0) = 1, f is<br />

x→0 + x→0 +<br />

continuous from the right at 0. Also lim f(x) = lim ex = e and lim f(x) = lim − x) =1,sof is discontinuous<br />

x→1− x→1 − x→1 + x→1 +(2<br />

at 1. Sincef(1) = e, f is continuous from the left at 1.<br />

41. f(x) =<br />

<br />

cx 2 +2x if x

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